The Reyssouze (French pronunciation: [ʁɛsuz]) is a river in the Ain department in eastern France. It is a left tributary of the Saône, which it joins near Pont-de-Vaux. It is 75.1 km (46.7 mi) long.^[1] Its source is in Journans, in the Bresse region. The Reyssouze flows generally northwest through the following communes: Montagnat, Bourg-en-Bresse, Attignat, Montrevel-en-Bresse and Pont-de-Vaux.

Reyssouze
Location
Country	France
Physical characteristics
Mouth
• location	Saône
• coordinates	46°26′33″N 4°53′40″E / 46.44250°N 4.89444°E / 46.44250; 4.89444
Length	75 km (47 mi)
Basin features
Progression	Saône→ Rhône→ Mediterranean Sea